How much does it cost to fix Biasi error code An 11?

Typical repair cost for the Biasi An 11 fault is £90-280 including labour.

An 11 High

Biasi An 11 Fault Code

Q: What does the Biasi An 11 fault code mean?

Your boiler is struggling to light its burner or cannot detect that a flame has been successfully lit, preventing it from heating your water.

Also written as AN11 — same fault.

The Biasi An 11 fault code means: your boiler is struggling to light its burner or cannot detect that a flame has been successfully lit, preventing it from heating your water.. It appears on 2 Biasi models in our database.

Technical description: Flame detection error (An flashing + number error flashing

Typical repair cost £90-280 (including labour)

DIY fix possible

Check if other gas appliances, like your hob, are working to ensure gas is reaching the property.Verify that your prepaid gas meter has credit if applicable.Press and hold the 'Reset' button for five seconds to see if the boiler restarts.

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Biasi models that show the An 11 fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Biasi An 11 fault code information on this page is sourced and cross-checked against the official Biasi service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026